I'm still thinking on this one. I'm fairly sure that Alaska became US territory later that month and therefore I'm assuming that period was during the handover and those events didn't get recorded. But I'll need to check and I'm too tired tonight.

“Men never commit evil so fully and joyfully as when they do it for religious convictions.” – Blaise Pascal

Ok - I think the answer is that Alaska went from the Julian Calendar to the Gregorian Calendar. Therefore, for residents, Friday, October 6, 1867 was followed by Friday, October 18, 1867—two Fridays in a row because of the date line shift.

The Julian Calendar is currently 13 day behind the Gregorian Calendar.

“Men never commit evil so fully and joyfully as when they do it for religious convictions.” – Blaise Pascal

Because wing feathers are used in the fletching of arrows and it is important to use feathers from the same wing. People mistakenly believed that a right handed bowman should use right wing feathers and vice versa, therefore due to the propensity for people to be right handed right wing feathers were in higher demand; due to the laws of supply and demand the prices rose accordingly.

If you can fill the unforgiving minute,With sixty seconds worth of distance run,Yours is the Earth and everything that's in it,And - which is more - you'll be a man my son.